Quote:
Originally Posted by MetroMPG
- new technology increases the combustion speed to consume more fuel before knocking can occur
- scavenging and expelling unburned elements, so as not to overheat intake air
- using a water jacket around the cylinder to regulate heat
|
Great article. Its cool to see how all the OEMs are tackling the new emissions and mileage regulations differently.
I'm pretty sure point #2 and #3 are supposed to be one though. They're using cooled EGR to not overheat the intake air. They do this by running it through an EGR cooler like a diesel has (and the latest gen Prius' engines). They need to cool the EGR because putting too much hot EGR into the intake mixture will cause knock instead of help prevent it, which is one of the advantages of EGR to begin with.